ece642-2-2

ece642-2-2 - ECE 642 - COMMUNICATION SYSTEMS I Lecture 2,...

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1 II. Linear Modulation © 2002 by Jacob Klapper ECE 642 - COMMUNICATION SYSTEMS I Lecture 2, Part 2 Linear Modulation Professor Jacob Klapper Department of Electrical and Computer Engineering New Jersey Institute of Technology II. Linear Modulation © 2002 by Jacob Klapper DSB-SC, SSB, VSB DSB-SC : Why and How 2- 30 DSB-SC : Linear modulation with Σ = 1 c cc c Tc 2 2 2 2 A x (t) x(t)A cos t Px ( t ) x ( t ) == II. Linear Modulation © 2002 by Jacob Klapper DSB-SC, SSB, VSB DSB-SC : Why and How (cont’d) 2- 31 Diagram : x(t) A cos t ω DSB SC
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2 II. Linear Modulation © 2002 by Jacob Klapper DSB-SC, SSB, VSB DSB-SC : Time-Domain 2- 32 II. Linear Modulation © 2002 by Jacob Klapper DSB-SC, SSB, VSB DSB-SC : Time-Domain (cont’d) 2- 33 II. Linear Modulation © 2002 by Jacob Klapper DSB-SC, SSB, VSB DSB-SC : Time-Domain (cont’d) 2- 34 x(t) < 0 gives same envelope as x(t) > 0 but carrier flips 180 ° Envelope detector gives full-wave rectified version of message . N.G.
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3 II.
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This note was uploaded on 09/14/2011 for the course ECE 642 taught by Professor Jacob during the Spring '11 term at NJIT.

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ece642-2-2 - ECE 642 - COMMUNICATION SYSTEMS I Lecture 2,...

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